Stopped-Vehicle Cut-In Detection With Dynamic Camera Thresholds
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Solution Overview
Problem
Existing driving assist systems fail to effectively detect vehicles that may cut in front of a host vehicle when it is stopped, as the detection methods used during travel are not suitable for stationary conditions.
Innovation Solution
The system sets a detection field for sensors in front of the host vehicle, using a different criteria for determining a cut-in when the vehicle is stopped, such as the area of the side surface of an approaching vehicle exceeding a smaller prescribed value, allowing earlier detection of potential cuts compared to using the rear surface area during travel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the same detection criteria (first prescribed value) is used for both traveling and stopped states, then the detection system is simple to operate, but vehicles cutting in front of the stopped host vehicle cannot be detected early enough
Solution Approach 1:
The patent applies dynamics by making the detection threshold dynamic rather than static. The control unit automatically switches between the first prescribed value (for traveling state) and the second prescribed value (for stopped state) based on the host vehicle's operational state. This dynamic adjustment enables the system to adapt to different detection requirements without manual intervention, resolving the contradiction between detection accuracy and system complexity.
Solution Approach 2:
The patent changes the detection parameter (threshold value) based on the host vehicle's state. When the vehicle is stopped, the threshold is lowered from the first prescribed value to the second prescribed value, allowing detection of smaller detection degrees that indicate potential cut-in vehicles. This parameter change enables reliable detection in stopped state while maintaining system simplicity through automatic state-based switching.
2Loss of time
If a smaller prescribed value (second prescribed value) is used when the host vehicle is stopped, then cut-in vehicles can be detected earlier, but the detection system becomes more complex
Solution Approach 1:
The patent applies preliminary action by pre-setting two different prescribed values (first and second) in the control unit, corresponding to different vehicle states. The system prepares these detection thresholds in advance and automatically selects the appropriate one based on whether the vehicle is traveling or stopped. This preliminary preparation enables fast detection response without requiring complex real-time calculations or manual adjustments.
Solution Approach 2:
The system dynamically switches between detection thresholds based on vehicle state. The control unit monitors the host vehicle's operational state and automatically adjusts the detection criterion from the first prescribed value to the second prescribed value when stopped. This dynamic adaptation reduces detection time for cut-in vehicles during stopped state while maintaining system simplicity through automated state-based switching.
Data Source
AI summary
A driving assist device includes a camera and a controller. The camera detects the presence of another vehicle ahead of a host vehicle. The controller sets a detection field of the camera. The controller determines that another vehicle has cut in front of the host vehicle if a degree to which the other vehicle has entered into the detection field exceeds or equals a first prescribed value when the host vehicle is traveling, or the other vehicle has cut in front of the host vehicle if the degree exceeds or equals a second prescribed value that is smaller than the first prescribed value when the host vehicle is stopped.